Horizontal ratchet feed finger for saw grinders



p 1929- R. J. HARRY 1,726,629

HORIZONTM; RATCHET FEED FINGER FOR SAW GRINDERS Filed y 5. 1928 3 Sheets-Sheet l 7 A ZEMETZIIA r f l #7! -5 Inventor I [III Attorney Sept. 3, 1929. R. J. HARRY 1,726,620

HORIZONTAL RATCHET FEED FINGER FOR SAW GRINDERS Filed May 25, 1928 3 SheetS Sheet 2 Way, Z

Inventor Attorney Sept. 3, 1929. R. J. HARRY 1,726,620

HORIZONTAL RATCHET FEED FINGER FOR SAW GRINDERS Filed May 25, 1928 3 Sheets-Sheet 3 Milk: 7/ Irwentar Patented Sept. 3, 1929.

UNETED STATES amaze ROBERT J HARRY, 0F HATTIESBURG, MISSISSIPPI.

HORIZONTAL RATCHE'I FEED FINGER FOR SAW GRINDER/S.

Application filed May 25,

The present invention relates to a horizontal ratchet feed finger for operation upon practically all types of automatic saw grinders and is desired for carrying the saw teeth under the emery with an even motion without any danger of injuring the teeth by dulling the sharpened edges thereof.

Another very important feature of the invention resides in the provision of a structure of this nature which releases around the teeth rather than over the ends thereof as is the common practice.

A still further very important object of the invention resides in the provision of a horizontal feed finger of this nature which is exceedingly simple in its construction, strong and durable, and thoroughly efiicient and reliable in use and operation.

With the above and numerous other objects in view, the invent-ion resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is a side elevation of a device embodying the features of my invention showing the same with portions of the conventional saw grinder,

Figure 2 is a top plan view thereof,

Figure 3 is a bottom plan view thereof,

Figure 4 is a longitudinal section therethrough,

Figure 5 is a transverse section therethrough taken substantially on the line 55 of Figure 4,

Figure 6 is another bottom plan view thereof, showing the parts adjusted to a different position to that shown in Figure 3,

Figure 7 is a perspective view of the arm of the device,

Figure 8 is a rear elevation of the device, and

Figure 9 is a perspective view of the engaging key.

Referring to the drawing in detail it will be seen that the numeral 5 denotes a knuckle including a body wit-h one end thickened and provided with an opening 6 extending from side to side and having a bushing 7 therein to form a bearing for re ceiving the wrist pin 8 of a suitable rocker 9.

Conventional adjusting means 10 is associated with the head of the rocker to control the wrist pin 8. The other end at the 1928. Serial No. 280,451.

knuckle 5 is extended downwardly and provided with a notch 11. Adjacent this other end a knuckle is provided with an opening 12 for loosely receiving a vertical stud bolt 13 which is anchored as will be hereinafter claimed.

A pair of stud bolts 14 are threaded through the knuckle between the openings 6 and 12 and adjacent/the latter and may be locked in adjusted position by means of jam nuts 15. A U-shaped plate 16 is disposed over the intermediate portion of the knuckle 5 and the bolts 13 and 14 extend through openings therein.

A yoke 17 comprises a; substantially rectangular body with an' opening 18 adjacent one end and a pair of longitudinally spaced openings 19 intermediate its ends and an opening 20 adjacent its other end for threadedly receiving the stud bolt 13 and from said other end there extends a tongue 21 into the notch 11.

The ends of the plate 16 terminate to the sides of this yoke to prevent-lateral play of the knuckles and'theyoke'inrelation to each other. A spring 22 is'disposed about the. 1

bolt 13 impinging against the he'ad 13 thereof at its upper end and against the plate 16 to urge theknu'ckle downwardly toward the yoke, it being noted that the studlbolts 14 engage or'bear' against the yoke 17 to space the bearing *endporti'onof the knuckle from the yoke the desired distance against the action of the spring 22.

The numeral 24 denotes'an elongated arm provided intermediate its ends with a longitudinally spaced opening 25 to receive bolts 26 which extends through the opening 18 to rockably mount the arm on the yoke so that said arm-may swing in a horizontal plane.

A transverse slot'27 is formed in the arm edge thereof and from the opposite side edge of the yoke 17 there depends a stud 31. The tongue and stud are provided with pins 32 pro ecting toward eachbther.

The ends of a coil spring 33 are d sposed about stems s2 and i inge aghast the stud 31 and the tongue 30 to normally hold the arm longitudinally'alined with the yoke, it being seen that the arm may be rocked to the limit afforded by the pin and slot connection provided by bolt 28 and slot 27.

Under the free end of the arm 24 there is mounted a longitudinaly extending shoe 34 adj ustably mounted by means of bolts 35 extending through transverse slots 36 formed in the arm 24. This shoe is adapted to engage against a stop pin 37 or the like pro vided on the platform 38 of the automatic grinder.

A key 39 of trapezoidal cross sectional formation is slidable in a transverse channel 40 provided on the upper face of the free end of the arm 24 being of dove tailed formation. One end of this key 39 is beveled inwardly toward the pivoted end of the arm. From the above detailed description it will be seen that as the rocker 9 swings in the direction of the arrow 43 in Figure 1 the grinder 44, of course, is out of engagement with the saw 4.5 and the key 39 is engaged with its beveled end 41 between two or the teeth of the saw 45 thereby causing the saw to advance and then as the rocker moves in an opposite direction to arrow 43 the beveled end 41 will cause the arm 24 to swing in the direction of the arrow- 4L6 in Figure 2 so as to pass around the tooth of the saw ratherthan over the toothof the saw and in this way the movement of thekey will n no way dull the tooth which has ust been sharpened.

The connection between the knuckle and the yoke afiorded by the bolt 13 with its spring 22 compensates for the arcuate movement of the head of the rocker 9 and tends to more firmly hold the key in engagement with the saw as it is advancing the saw as will be apparent.

This tension, of course may be ad usted by the stud bolts 14. With this device t is possible to obtain an even stroke at all times without any danger of inJuring, dulling or otherwise detrimentally afiecting the saw teeth. The structure is simple, capable of all necessary adj ustmentgmay be manufactured at a low cost and yet be strong and durable, and thoroughly etficient and reliable in use and operation.

It is thought that the construction, operation, utility and advantages of the invention will now be quite apparent to those skilled in this art without a more detailed description thereof.

The present embodiment of the invention has been disclosed in detail merely by way of example, since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description.

It will be apparent that changes in the details of construction, and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is:

1. A feed finger for saw grinders comprising a rocker arm knuckle including a body having a hearing at one end for engagement with the rocker arm, an opening adjacent the other end and a notch at said other end, a yoke having a tongue at one end in the notch; and an arm, means pivoting an intermediate portion of the arm below the other end of the yoke, a pin and slot connection between the yoke and the arm to limit the swinging of the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, and a bolt threaded through the knuckle to bear against the yoke.

2. A feed finger for saw grinders comprising a rocker arm knuckle including a body having a bearing at one end, an opening adjacent the other end and a notch at said other end, a yoke having a tongue at one end in the notch, an arm, means pivoting an intermediate portion of the arm below the other end of the yoke, a pin and slot connection between the yoke and the arm to limit the swinging of the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, a bolt threaded through the knuckle to bear against the yoke, and a U-shaped plate on the knuckle extending down to terminate alongside of the yoke to limit lateral movement of the yoke and the knuckle in relation to each other.

3. A feed finger for saw grinders comprising a rocker arm knuckle including a body having a hearing at one end with which the wrist pin of a rocker may engage, an opening adjacent the other end and a notch at said other end, said other end with the notch being extended downwardly, a yoke having a tongue at one end in the notch, an arm, means pivoting an intermediate portion of the arm below the other end of the yoke, a pivot slot connection between the yoke and the arm to limit the swinging of the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, and a bolt threaded through the knuckle to bear against the yoke.

a; A feed finger for saw grinders comprising a rocker arm knuckle including a body having a bearing at one end with which the wrist pin of a rocker may engage, an opening adjacent the other end and a notch atsaid other end, said other end with the notch being extended downwardly, a yoke having a tongue at one end in the notch, an arm. means pivoting an intermediate portion of the arm below the other end of the yoke, a pivot slot connection between the yoke and the arm to limit the swinging of the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, and a bolt threaded through the knuckle to bear against the yoke, a U-shaped plate extending over the muckle and terminating down alongside of the side of the yoke to prevent lateral movement of the yoke and knuckle in relation to each other.

5. A feed finger for saw grinders comprising a rocker arm knuckle including a body having a bearing at one end for engagement with the rocker arm, an opening adjacent the other end and a notch at said other end, a yoke having a tongue at one end in the notch; and an arm, means pivoting an intermediate portion of the arm below the other end of the yoke, a pin and slot connection between the yoke and the arm to limit the swinging of the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, and a bolt threaded through the knuckle to bear against the yoke, a shoe adjustably mounted on the free end of the arm to cooperate with a pin on the grinder to limit the movement of the arm toward the saw being operated upon in the grinder.

6. A feed finger tor saw grinders comprising a rocker arm knuckle including a body having a bearing at one end for engagement with the rocker arm, an opening adjacent the other end and a notch at said other end, a yoke having a tongue at one end in the notch; and an arm, means pivoting an intermediate portion oi the arm below the other end of the yoke, a pin and slot connection between the yoke and the arm to limit the swinging oi" the arm in relation to the yoke, a key extending laterally from the arm, a bolt extending through the opening in the knuckle and engaged with the yoke, a spring on the bolt impinging against the knuckle, and a bolt threaded through the knuckle to bear against the yoke, a key extending laterally across the free end of the arm having a beveled end for engaging with the saw in the grinder.

In testimony whereof I aflix my signature.

ROBERT J. HARRY. 

